i will now blame my nonexistant dating life on these sites. from the new york times:

Framed in pink, the DontDateHimGirl.com site allows a woman to post the name and photograph of a man she says has wronged her, along with a short but often pungent synopsis of how precisely she was aggrieved. The suspicious or merely curious can hunt for a cheater by typing a name into the search engine. Women can also send e-mail messages through the site if they want to ask more pointed questions about a particular cad. In a slight nod to fairness, men who disagree with the characterization can write a rebuttal to be posted alongside their names.

the article mentions DontDateHimGirl.com, ManHaters.com and TrueDate.com.

link
found via: lifehacker